1st of all, folks, let's be rational, we're talking a NON-Functional microwave oven. (read: Inert).. No power applied.. thus, the maser is not radiating ANY radiation.
To answer R_Phoenix, Yes, they usually are within the cage of the maser itself. sometimes side by side (can't remember the maker, but 1-inch diameter, 3.5-Inch long bar magnets.) and sometimes, top & bottom of the device.. (if you look inside the cage of the maser, you'll see two 'Doughnut' magnets on the top & bottom.)
(See insert photo for example.)
Dismantling the maser, without opening the internal tube, You can retrieve the magnets. As I've said, I've done it many times, scrapping dead and non-functioning microwave ovens, as well scavengening the control panels for electronic devices.
There was a video on YouTube, where someone tried to show how putting a pile of popcorn kernals between two cell phones, caused enough radiation to pop the popcorn.. However, the hoax was revealed, that the person had put a functioning maser under the table, under the pile of kernals.. (I can imagine the person is looking forward to some serious health problems as he continued using the hoax.)
Sigh. It's still not a MASER. That's part of the problem; if it were a MASER there would be a nice beam and you could take some comfort in not standing where the beam goes. But it's just a somewhat directional Microwave emitter (a "Magnetron") that has about the same resemblence to a MASER that a floodlight has to a LASER.
Thank you, West. Now, it we retrieve the magnets from the maser, lol. just kidding... Some nice strong magnets would make it well worth a few minutes of disassembly.. Last night I took a look around to inventory what I could re-use out old devices. I noticed for example there was a lot of modems and routers I could potentially re-use for completely different purposes, by reprogramming the firmware for example. We should start a thread on recycling projects, and avoid the red flags with more purposeful ideas.
Speaking if Re-useing, one of my simple projects
Nice project there , much more productive than trying to build a number plate melter fromn an old microwave.
Nice project there , much more productive than trying to build a number plate melter fromn an old microwave.